Girls, 31 weeks pregnant. Already the second time I noticed that at ni…

Girls, 31 weeks pregnant. Already the second time I noticed that at night I'm wheezing, like my heart is hurting and it's hard to breathe, and today it's really bad, even my ribs feel like they're being squeezed in, now I have a heavy breath, choked... It seems like I got up, walked around, and it passes, I'm sitting here now and everything seems fine, ugh... Maybe anyone has experienced this? Or does anyone know what could be?